Why Teradyne, Inc. (TER) stock moved
Teradyne, Inc. (TER) shares rose 3.7% to $415.79 at the October 1, 2026 close, a moderate gain from the prior close of $400.91. That close is the latest confirmed price for TER; a live quote was not available. BestStocks flagged the session as a major change for TER. Below, we break down what changed for TER, why it matters for investors, how the stock reacted, and the catalysts on the calendar.
TER climbed 3.7% to $415.79
Teradyne shares rose 6.25% to $441.76 following positive analyst attention and momentum from the launch of its new Magnum E2 memory test system for AI applications, according to multiple Yahoo Finance sources. The gain reflects renewed confidence in the company's semiconductor test equipment positioned for high-bandwidth memory and data center chips, with analyst upgrades providing additional support. Teradyne earnings on 2026-10-27 (consensus EPS: $2.08); watch for shipment trends and forward guidance on Magnum E2 adoption among memory chipmakers.
What it means for Teradyne, Inc. investors
For Teradyne, Inc. investors, the recent signals are mixed, leaving the near-term picture neutral / mixed. On the constructive side: Positive 3.7% session move; Positive price momentum. Weighing against that: Teradyne fell 11.81% to $334.89 intraday, despite inclusion in a Zacks article (dated 2026-09-14) highlighting the company among five top-ranked wide-moat stocks with strong growth prospects and favorable demand; Teradyne fell 6.53% to $377.91 as semiconductor test equipment stocks faced a broad derisking wave on Wednesday, with peers Aehr Test Systems down 10% and FormFactor down 6% (247wallst.com). BestStocks rates the overall signal quality low (44/100). With earnings roughly 25 days out, the next report is the most likely near-term test of the move.
TER price reaction
TER last traded at $415.79, up $14.88 (+3.71%) from the previous close of $400.91.
The bull and bear case for TER stock
Weighing the constructive signals against the risks, here is how the bull and bear case for Teradyne, Inc. (TER) lines up on the latest data.
The bullish case
- Positive 3.7% session move.
- Positive price momentum.
The bearish case
- Teradyne fell 11.81% to $334.89 intraday, despite inclusion in a Zacks article (dated 2026-09-14) highlighting the company among five top-ranked wide-moat stocks with strong growth prospects and favorable demand.
- Teradyne fell 6.53% to $377.91 as semiconductor test equipment stocks faced a broad derisking wave on Wednesday, with peers Aehr Test Systems down 10% and FormFactor down 6% (247wallst.com).
- Teradyne fell 6.51% to $327.13 amid a broader semiconductor sector selloff triggered by TSMC's capital expenditure reset and profit-taking in AI-linked chip stocks, compounded by insider selling from CEO Gregory Smith and Director Marilyn Matz ahead of Q2 earnings.
Weighing both sides, BestStocks' composite read of recent signals is roughly balanced, as the bull-versus-bear meter above shows. This is an educational summary of the bull and bear case, not investment advice.
Previous notable changes for TER
Frequently asked questions about TER
Why did Teradyne, Inc. (TER) stock move?
TER rose 3.7% to $415.79. The move coincided with the context summarized above, though no single company-specific catalyst was independently confirmed.
How much did TER stock rise?
TER gained 3.71% ($14.88) versus the prior close of $400.91, last trading at $415.79.
When is Teradyne, Inc.'s next earnings date?
TER's next earnings report is scheduled for 2026-10-27 — about 25 days away.
How BestStocks tracks TER
This page is generated automatically by BestStocks' change-detection system after its price and volume cleared TER-specific materiality thresholds, triggering an evidence check. It draws on 20 tracked change events for TER, cross-checked against the data sources listed below. A live intraday quote was not available, so price and volume figures are the confirmed end-of-day close from October 1, 2026 — not the current price — and the percentage move is that session's. They refresh once live quotes resume. For companies with multiple share classes, market-cap figures can differ by data source. Analyst price targets and ratings are FMP consensus. This is an educational summary of what changed and why — not personalized investment advice.